diff --git a/src/Makefile b/src/Makefile
index e55d63d..dad2706 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -115,7 +115,7 @@ endif
 
 REDIS_SERVER_NAME=memdbd
 REDIS_SENTINEL_NAME=redis-sentinel
-REDIS_SERVER_OBJ=adlist.o ae.o anet.o dict.o redis.o sds.o zmalloc.o lzf_c.o lzf_d.o pqsort.o zipmap.o sha1.o ziplist.o release.o networking.o util.o object.o db.o replication.o rdb.o t_string.o t_list.o t_set.o t_zset.o t_hash.o config.o aof.o pubsub.o multi.o debug.o sort.o intset.o syncio.o migrate.o endianconv.o slowlog.o scripting.o bio.o rio.o rand.o memtest.o crc64.o bitops.o sentinel.o notify.o setproctitle.o hyperloglog.o latency.o sparkline.o module.o
+REDIS_SERVER_OBJ=adlist.o ae.o anet.o dict.o redis.o sds.o zmalloc.o lzf_c.o lzf_d.o pqsort.o zipmap.o sha1.o ziplist.o release.o networking.o util.o object.o db.o replication.o rdb.o t_string.o t_list.o t_set.o t_zset.o t_hash.o config.o aof.o pubsub.o multi.o debug.o sort.o intset.o syncio.o migrate.o endianconv.o slowlog.o scripting.o bio.o rio.o rand.o memtest.o crc64.o bitops.o sentinel.o notify.o setproctitle.o hyperloglog.o latency.o sparkline.o module.o rbtree.o
 REDIS_CLI_NAME=memdb
 REDIS_CLI_OBJ=anet.o sds.o adlist.o redis-cli.o zmalloc.o release.o anet.o ae.o crc64.o
 REDIS_BENCHMARK_NAME=redis-benchmark
diff --git a/src/rbtree.c b/src/rbtree.c
new file mode 100644
index 0000000..8f48992
--- /dev/null
+++ b/src/rbtree.c
@@ -0,0 +1,50 @@
+/* rbtree.c - red-black tree implementation
+ *
+ * Copyright (c) 2006-2014, nickey woo <thenickey at gmail dot com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   * Redistributions of source code must retain the above copyright notice,
+ *     this list of conditions and the following disclaimer.
+ *   * Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *   * Neither the name of Redis nor the names of its contributors may be used
+ *     to endorse or promote products derived from this software without
+ *     specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "redis.h"
+
+rbtree *createRbtree()
+{
+    rbtree *tree = zmalloc(sizeof(*tree));
+    tree->root = NULL;
+    tree->length = 0;
+    return tree;
+}
+
+void releaseRbtree(rbtree *tree)
+{
+
+    zfree(tree);
+}
+
+
+
+
+
diff --git a/src/redis.h b/src/redis.h
index d685e0d..bfad365 100644
--- a/src/redis.h
+++ b/src/redis.h
@@ -198,6 +198,7 @@ typedef long long mstime_t; /* millisecond time type. */
 #define REDIS_ENCODING_ZIPLIST 5 /* Encoded as ziplist */
 #define REDIS_ENCODING_INTSET 6  /* Encoded as intset */
 #define REDIS_ENCODING_SKIPLIST 7  /* Encoded as skiplist */
+#define REDIS_ENCODING_RBTREE 8 /* Encoded as red-black tree */
 
 /* Defines related to the dump file format. To store 32 bits lengths for short
  * keys requires a lot of space, so we check the most significant 2 bits of
@@ -564,6 +565,22 @@ typedef struct zset {
     zskiplist *zsl;
 } zset;
 
+/* red-black tree */
+typedef struct rbNode {
+    unsigned color:1;
+    struct rbNode *parent;
+    struct rbNode *left, *right;
+    robj *obj;
+} rbNode;
+
+typedef struct rbtree {
+    rbNode *root;
+    unsigned long length;
+} rbtree;
+
+rbtree *createRbtree();
+void releaseRbtree(rbtree *tree);
+
 typedef struct clientBufferLimitsConfig {
     unsigned long long hard_limit_bytes;
     unsigned long long soft_limit_bytes;